Fringe star John Noble has revealed that he understands why Walternate behaves the way he does.

Speaking to IGN, Noble explained that he has enjoyed shaping a different version of his character.

"You basically take Walter from a certain point and progress him differently after 17 or 18 years," he said. "It's really interesting. But if the groundwork is right, then it's not an impossible task. You're not really guessing too much either."

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Noble added that Walternate's behaviour is understandable, saying: "What Walternate is is a very human character who's had his son stolen. That would be enough to drive anyone to distraction. He has become, because of his strength and intelligence, the natural leader of this disintegrating world. And so he behaves in a certain way. He's also fuelled by revenge and anger. These are all human things. You start to put them in a certain place and you get Walternate."

He continued: "I can justify every action that takes place in the alternate universe. I'd rather live here than there, but I can justify every action that takes place."

Noble also hinted that Walternate's relationship with Broyles in the other world will be important in future episodes.

"These two men, there is a respect," he said. "But Broyles is a strong character. How much he will go along with things is to be revealed. I'm not going to tell you! It's critical. It's a really critical thing how much Broyles will go along with what's going on. But he and Walter have some really beautiful stuff."